I have been contacting Microsoft Support multiple times, at least six, and each time someone promises to sort out the problem. Never happens. I have been given instructions to send the information from the 'View Message Source', send them the original email by downloading it and then use the Problem Steps Recorder to demonstrate the problems I am having.
I copied the View Message Source and saved it as instructed but the Secure File Exchange would not accept them.
I followed the instruction to send them a copy of the original email but when I came to download the message my computer, or Microsoft that is, warned me it come harm my system!!
I used the PSR as instructed, but whilst it recorded what I was doing, it didn't record the all important highlighted message I got when trying to add a domain to the Block list.
Think I am resigned to just changing my email address and being a lot more careful on who I divulge it to. I have had the same one since email began and a lot of things have changed since with regard to privacy, so maybe if I change it I will get at least a period of time before the spammers get me again.
Microsoft are not interested, and neither it seems is anyone else !!